本文選題：海水　切入點：高密度澄清池　出處：《天津城建大學(xué)》2013年碩士論文　論文類型：學(xué)位論文

【摘要】：針對目前傳統(tǒng)海水凈化工藝抗沖擊負(fù)荷能力差、基建與運行費用高、清洗頻繁及微生物污染嚴(yán)重等問題,本試驗以曹妃甸近岸港口海水為研究對象,將高密度澄清工藝應(yīng)用于海水凈化,主要開展了以下3個方面的研究和探索： (1)通過對試驗原水的水質(zhì)進行相關(guān)檢測和考察后發(fā)現(xiàn)：原水中顆粒物含量總體較少,濁度較低,粒徑偏小,且水質(zhì)波動相對較大,這些都為凈化工藝增加了難度。 (2)在對工藝運行的最佳條件進行探索后發(fā)現(xiàn)： ①混凝劑種類、投加量、攪拌速度、污泥回流量、次氯酸鈉投加量以及排泥周期等條件對出水水質(zhì)均有一定程度的影響； ②最佳運行條件為：混凝劑選用FeCl3,劑量為15mg/L,攪拌速度400r/min(G值為586.6s-1),污泥回流比15%,次氯酸鈉投加量為1mg/L,排泥周期為8h。 (3)在對工藝的處理效能方面進行了連續(xù)監(jiān)測和分析后得出結(jié)論：高密度澄清工藝對不同污染指標(biāo)的去除效果有所不同,次氯酸鈉對工藝處理效能的提升有一定的促進作用,具體表現(xiàn)為： ①在濁度的去除方面,高密度澄清工藝表現(xiàn)出了很強的穩(wěn)定性,出水濁度基本保持在4-5NTU左右； ②在藻類的去除方面,高密度澄清工藝在未投加次氯酸鈉的情況下處理效果并不理想,在原水葉綠素a平均含量13.83μg/L的情況下,投加次氯酸鈉以后,可將出水的葉綠素a含量由11.36μg/L降低至6.94μg/L； ③在有機物的去除方面,投加次氯酸鈉以后,CODMn、UV254的去除率有了較大幅度的提升,CODMn的去除率由原來的30%左右提升至50%左右,UV254的去除率由原來的26%左右提升至45%左右； ④在除鐵方面,由于投加的鐵鹽混凝劑,出水的鐵含量有所上升,但投加次氯酸鈉后,情況有所緩解； ⑤在活性硅酸鹽的去除方面,投加次氯酸鈉能夠提升高密度澄清工藝的去除效果,可將出水的平均活性硅酸鹽含量由1.73mg/L降低至1.59mg/L。
[Abstract]:At present, the traditional water purification process of anti shock loading capability is poor, infrastructure and high operation cost, frequent cleaning problems and microbial pollution, the coastal port of Caofeidian sea water as the research object, the high density clarification process used in water purification, mainly carried out the research and exploration of the following 3 aspects:
(1) by detecting and investigating the quality of raw water, it is found that the content of particulate matter in raw water is less, turbidity is lower, particle size is smaller, and the fluctuation of water quality is relatively large, which all adds difficulty to the purification process.
(2) after exploring the best conditions for the operation of the process, it is found that:
1. Coagulant type, dosage, stirring speed, sludge reflux, sodium hypochlorite dosage and sludge discharge period have some influence on effluent quality.
(2) the best operation conditions are as follows: coagulant dosage is FeCl3, dosage is 15mg/L, stirring speed is 400r/min (G value is 586.6s-1), sludge reflux ratio is 15%, sodium hypochlorite dosage is 1mg/L, sludge discharge period is 8h..
(3) after continuous monitoring and analysis of process efficiency, it is concluded that high density clarification process has different effects on different pollution indicators, and sodium hypochlorite can improve the processing efficiency.
(1) in the removal of turbidity, the high density clarification process has shown strong stability, and the turbidity of the effluent is basically around 4-5NTU.
The removal of algae, high density in the clarification process without adding sodium hypochlorite under the condition of the treatment effect is not ideal, the average content of chlorophyll a in raw water of 13.83 g/L cases after adding sodium hypochlorite, the water content of chlorophyll a decreased from 11.36 g/L to 6.94 g/L;
(3) after removal of sodium hypochlorite, the removal rate of CODMn and UV254 increased greatly. The removal rate of CODMn increased from about 30% to 50%, and the removal rate of UV254 increased from about 26% to 45%.
In the field of iron removal, the iron content of the effluent was increased because of the added iron salt coagulant, but the situation was relieved after the addition of sodium hypochlorite.
(5) in the removal of active silicate, adding sodium hypochlorite can improve the removal efficiency of high-density clarification process, and the average active silicate content of effluent can be reduced from 1.73mg/L to 1.59mg/L..

【學(xué)位授予單位】：天津城建大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2013
【分類號】：P746;TU991.2

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